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Mechanism for decrease in cardiac output with atrial natriuretic peptide in dogs.

R W Lee1, S Goldman

  • 1Department of Internal Medicine, Tucson Veterans Administration Medical Center 85723.

The American Journal of Physiology
|March 1, 1989
PubMed
Summary
This summary is machine-generated.

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Atrial natriuretic peptide (ANP) lowers cardiac output by reducing total blood volume, not by affecting heart function or vascular resistance. This leads to decreased venous pressure and volume, ultimately impacting cardiovascular dynamics.

Area of Science:

  • Cardiovascular Physiology
  • Endocrinology
  • Renal Physiology

Background:

  • Atrial natriuretic peptide (ANP) is a hormone involved in regulating blood pressure and fluid balance.
  • The precise mechanisms by which ANP influences cardiac output are not fully understood.

Purpose of the Study:

  • To investigate the hemodynamic effects of atrial natriuretic peptide (ANP) in dogs.
  • To elucidate the mechanism by which ANP decreases cardiac output.

Main Methods:

  • Administration of ANP via bolus and infusion in eight dogs.
  • Measurement of cardiac output, mean aortic pressure, heart rate, vascular resistance, and blood flow distribution.
  • Assessment of venous compliance, unstressed vascular volume, and arterial compliance.

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Main Results:

  • ANP decreased mean aortic pressure and cardiac output without altering heart rate or total peripheral vascular resistance.
  • A significant reduction in total blood volume and central blood volume was observed.
  • Increased resistance to venous return and increased arterial compliance were noted, alongside increased renal blood flow.

Conclusions:

  • Atrial natriuretic peptide (ANP) decreases cardiac output primarily by reducing total blood volume.
  • The observed decrease in cardiac output is attributed to lower operating pressure and volume within the venous capacitance system.
  • Cardiac factors and splanchnic blood flow redistribution are not significant contributors to ANP-induced reductions in cardiac output.